Kimbrough, Robert A., and Litke, David W., 1998, Pesticides in surface water in agricultural and urban areas of the South Platte River Basin, from Denver, Colorado, to North Platte, Nebraska, 1993-94: U.S. Geological Survey Water-Resources Investigations Report 97-4230, 66 p. Available Online

Kratzer, Charles R., 1998, Pesticides in storm runoff from agricultural and urban areas in the Tuolumne River Basin in the vicinity of Modesto, California: U.S. Geological Survey Water-Resources Investigations Report 98-4017, 17 p. Available Online

Kratzer, Charles R., and Shelton, Jennifer L., 1998, Water quality assessment of the San Joaquin-Tulare Basins, California: Analysis of available data on nutrients and suspended sediment in surface water, 1972-1990: U.S. Geological Survey Professional Paper 1587, 92 p. Available Online